~1,600+ words. Optimized for search intent, technical depth, and actionable resolution steps.
[ERROR] [VPN] Connection aborted: unsupported protocol version (28201) That points to outdated client or server TLS version mismatch (e.g., server requires TLS 1.2 but client tries 1.0). error 28201 kerio vpn client
[ERROR] [VPN] SSL handshake failed: certificate verify failed (error: 28201) [INFO] Server certificate common name does not match requested hostname. This confirms a hostname mismatch. Another common line: ~1,600+ words
The cryptic nature of this error code leaves many users confused. Does it indicate a network issue? A server configuration problem? An SSL handshake failure? 600+ words. Optimized for search intent